#include<stdio.h>
int main(int argc, const char *argv[])
{
	float score;

	printf("请输入分数：");
	scanf("%f",&score);
	if(score<0||score>100)
	{
		printf("无效的分数\n");
		return 0;
	}
	if(score>=90&&score<=100)
		printf("成绩优秀A\n");
	
	return 0;
}
